ETSI PRETS 300 903-1996 数字蜂窝通信系统(第2+阶段).GSM公共陆地移动网络(PLMN)系统中语音业务的传输规划方面(GSM 03.50,版本5.0.1)
Digital Cellular Telecommunications System (Phase 2+); Transmission Planning Aspects of the Speech Service in the GSM Public Land Mobile Network (PLMN) System (GSM 03.50 Version 5.0.1)